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Douglas Harper's Etymology Dictionary
preformed

c.1600, from Latin praeformare or else from pre- + formed (see form (v.)). Of plastic and synthetic products, from 1918.

Wiktionary
preformed
  1. formed, constructed or assembled in advance v

  2. (en-past of: preform)

Usage examples of "preformed".

Floating downwards towards the newly-dug trench and the bed of gravel on which it was to rest was the ponderous and massive form of a preformed tunnel section.

Deer within deer within deer, all Preformed, through the female lineage.

At the very least, she could expect a fair hearing, free from preformed suspicions like she faced down here.

Tranto, glowing with the energy of the strange attractors he had consumed, was enthusiastic about shoving the piles of broken building materials from side to side, heaping marble on cinder block, plaster on preformed plastics.

Droog looked at the core again, turned it, and struck off another small chip to form a platform, opposite to the end of the previous striking platform, then removed a second preformed flake.

A rather thick flake fell away, having the same shape as the preformed oval top, and an edge that was razor sharp.

We design and perform an experiment, or make observations, according to a preformed set of ideas or concepts in our mind.

Tranto, glowing with the energy of the strange attrac-tors he had consumed, was enthusiastic about shoving the piles of broken building materials from side to side, heaping marble on cinder block, plaster on preformed plastics.

My bathroom is one of those preformed fiberglass units with everything molded into it, including a towel bar, a soap holder, and a cutout for a window that looks out at the street.

Below the hill the valley was a lake of flame as Bill Johnson climbed toward the cottage some two hundred yards from the little group of preformed buildings he had left behind.